Don't copy extraneous files in the html directory.

tools/create_sdk.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 # A script which will be invoked from gyp to create an SDK.
 #
 # Usage: create_sdk.py sdk_directory
 #
@@ skipping 208 matching lines @@
     assert filename.endswith('.dart')
     if filename == 'io.dart':
       continue
     dest_file.write('#source("runtime/' + filename + '");\n')
   dest_file.close()
 
   #
   # Create and populate lib/{core, crypto, isolate, json, uri, utf, ...}.
   #
 
-  for library in ['_internal', 'html', 'core', 'coreimpl',
-                  'crypto', 'isolate', 'json', 'math', 'mirrors',
-                  'scalarlist', 'uri', 'utf']:
+  os.makedirs(join(LIB, 'html'))
+  for library in ['_internal', 'core', 'coreimpl', 'crypto', 'isolate',
+                  join('html', 'dart2js'), join('html', 'dartium'), 'json',
+                  'math', 'mirrors', 'scalarlist', 'uri', 'utf']:
     copytree(join(HOME, 'lib', library), join(LIB, library),
              ignore=ignore_patterns('*.svn', 'doc', '*.py', '*.gypi', '*.sh'))
 
 
   # Create and copy pkg.
   PKG = join(SDK_tmp, 'pkg')
   os.makedirs(PKG)
 
   #
   # Create and populate pkg/{args, intl, logging, meta, unittest}
@@ skipping 81 matching lines @@
   if revision is not None:
     with open(os.path.join(SDK_tmp, 'revision'), 'w') as f:
       f.write(revision + '\n')
       f.close()
 
   move(SDK_tmp, SDK)
   utils.Touch(os.path.join(SDK, 'create.stamp'))
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))